Hi,

I have tried to make som changes in an existing and well working package, that I did not make myself. The package is Nibbles Mail Engine.
When I install the package - even if all I do is rebuild the project - I get the following error when using the package.

The base class includes the field ‘ScriptManager1’, but its type (System.Web.UI.ScriptManager) is not compatible with the type of control (System.Web.UI.ScriptManager).

I have searched the web, and I suspect the problem is the reference to System.Web.Extensions. I can see in Visual Studio 2008, that the reference is to System.Web.Extensions 3.5...im not sure though.

Additional info

Problem occurs when loading a file wich is located in the umbraco/dialogs folder. If any help the first few lines of code is:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="mailing.aspx.cs" Inherits="Nibble.Umb.MailEngine.dialogs.mailing" %>

<%@ Register Assembly="EO.Web" Namespace="EO.Web" TagPrefix="eo" %>

<%@ Register Assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" Namespace="System.Web.UI" TagPrefix="asp" %>

Any help is very much appreciated,

Mikkel